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Editorial Team
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Asked: 2026-05-13T07:14:58+00:00

This had been driving me crazy…. I have an iPhone app that is using

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This had been driving me crazy….

I have an iPhone app that is using an Apple sample cpp file. The cpp file is aqofflinerender.cpp.

When I compile the Apple sample project, AQOfflineRenderTest, it compiles correctly. When I copy the aqofflinerender.cpp file to my project and reference a method within the file exactly as the Apple sample, I get the following error:

    cd /Users/mike/Documents/xcode/insultthem
    setenv IPHONEOS_DEPLOYMENT_TARGET 3.0
    setenv MACOSX_DEPLOYMENT_TARGET 10.5
    setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin"
    /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk "-L/Users/mike/XCode Projects/Debug-iphoneos" "-F/Users/mike/XCode Projects/Debug-iphoneos" -filelist "/Users/mike/XCode Projects/insultthem.build/Debug-iphoneos/insultthem.build/Objects-normal/armv6/insultthem.LinkFileList" -mmacosx-version-min=10.5 -Wl,-dead_strip -miphoneos-version-min=3.0 -framework Foundation -framework UIKit -framework CoreGraphics -framework AVFoundation -framework SystemConfiguration -framework AudioToolbox -framework CoreData -framework MessageUI -framework IOKit -o "/Users/mike/XCode Projects/Debug-iphoneos/insultthem.app/insultthem"
Undefined symbols:
  "_DoAQOfflineRender", referenced from:
      -[AudioFileManipulation combineFiles:newFileName:] in AudioFileManipulation.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

In .m file, the method is defined as follows:

extern void DoAQOfflineRender(CFURLRef sourceURL1, CFURLRef sourceURL2, CFURLRef sourceURL3, CFURLRef destinationURL);

In the .cpp file, the method is as follows:

void DoAQOfflineRender(CFURLRef sourceURL1, CFURLRef sourceURL2, CFURLRef sourceURL3, CFURLRef destinationURL) {

Does anyone have any suggestions for resolving this?

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1 Answer

  1. Editorial Team

    Ok… Figured it out…. according to another post, in the aqofflinerender.cpp file, I surrounded the function as follows:

    #if __cplusplus
extern "C" {
#endif

void DoAQOfflineRender(CFURLRef sourceURL, CFURLRef destinationURL) 
{
...
}


#if __cplusplus
}
#endif

    Weird…. cause it works in the Apple example without the #if __cplusplus lines. Guessing that there is a compiler option missing in my project…

    These lines tell the compiler to export the function name as the symbol so the other classes can “see” the function.

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